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Rudiy27
3 years ago
15

Ryan tried to solve the system of equations shown below.

Mathematics
1 answer:
Romashka-Z-Leto [24]3 years ago
4 0

Answer:

I believe the answer is A

He is correct. If the second equation is multiplied by 2 and added to the first equation, the result is 0=3 , which means the system has no solution.

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Suppose you have a sample of size 42 with a mean of 30 and a population standard deviation of 7.4. What is the maximal margin of
9966 [12]

Answer:

The maximal margin of error associated with a 95% confidence interval for the true population mean is 2.238.

Step-by-step explanation:

We have given,

The sample size n=42

The sample mean \bar{x}=30

The population standard deviation \sigma=7.4

Let \alpha be the level of significance = 0.05

Using the z-distribution table,

The critical value at 5% level of significance and two tailed z-distribution is

\pm z_{\frac{0.05}{2}}=\pm 1.96

The value of margin of error is

ME=z_{\alpha/2}(\frac{\sigma}{\sqrt{n}})

ME=1.96(\frac{7.4}{\sqrt{42}})

ME=1.96(1.1418)

ME=2.238

The maximal margin of error associated with a 95% confidence interval for the true population mean is 2.238.

4 0
3 years ago
19. Rae supervises a loading dock. She
Rina8888 [55]

Answer:

85% of the job is finished.

Step-by-step explanation:

The way to find the percentage is to divide 119 by 140, which will come out to be .85.

Multiply .85 by 10 to have it as a whole number for the percentage.

5 0
2 years ago
Write two expressions with the solution set of {5}, (make it simple)
Montano1993 [528]
I have no idea ☠️ i just need to answer questions to be able to ask questions
4 0
2 years ago
WHAT IS 41SQUARED PLUS XSQUARED +213?
Bingel [31]

Answer:

1894+x^2

Step-by-step explanation:

1894+x^2

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Adding 213 makes it 1894.

And you end up with the expression 1894+x^2

Hope this helps!

4 0
3 years ago
A rectangle has a length that is 4 units longer than the width. If the width is increased by 7 units and the length increased by
Savatey [412]

Answer:

A = (x + 7)(x + 9)

Step-by-step explanation:

Let the width w = x

then length l = w + 4 = x + 4

Area =  length x width

        = x(x+4)

Then the the width is increased by 7 units and the length increased by 5 units.

w = x + 7

l = (x + 4) + 5 =x + 9

A = (x + 7)(x + 9)

5 0
3 years ago
Read 2 more answers
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